Summary:[Xbox Live Arcade] Strategically place your towers on the map to prevent alien enemies from stealing your power cores. Play for just fifteen minutes or several hours! This award-winning game includes 10 hours of story play with 20 unique maps in the Awakening campaign, four bonus Borderlands maps, a wide variety of tower and enemy types, an interactive soundtrack, plus over 100 unlockable challenge modes adding dozens of hours of additional fun. Protect the Cores. [Hidden Path]